Rails 3.1 - Confoo

Another new version of Rails. Delightful. And terrifying. What's changed this time? Fear Not!

We'll be reviewing the changes and additions to Rails 3.1, giving you a walk-through of what it all means (asset pipeline, what?), in the context of a brand new app, and an older app that will need to be upgraded.

Transcript

1. Rails 3.1 Lori Olson Confoo 2012 Montreal, QC
2. Another new version of Rails. Delightful. And terrifying. What's changed this time?
3. Summary • jQuery • CoffeeScript • SASS • Asset Pipeline • Miscellaneous cool stuff
4. But... • What about Rails 3.2? • only released a few weeks ago • not nearly as many scary changes
5. jQuery
6. • How to go back to Prototype (not recommended • rails new my_app -j prototype What you HAVE to know
7. Differences • Gemfile gem ‘jquery-rails’ • application.js //= require jquery //= require jquery_ujs
8. But... Why jQuery?
10. CoffeeScript
11. • Nothing • Absolutely not required • Just remove one line from Gemfile • gem 'coffee-rails' • And you don’t even have to do this What you HAVE to know
12. Thomas Fuchs on CoffeeScript • May 2011 - "I just like javascript too much to have a use for that, but I understand why other people might like it" • Aug 2011 - There, it happened. Mistakenly typed CoffeeScript in a .js file. So easy to pick up, and so natural.
13. CoffeeScript Resources • Railscasts • CoffeeScript Basics • http://railscasts.com/episodes/267-coffeescript-basics • Peepcode • Meet CoffeeScript • http://peepcode.com/products/coffeescript • Books • Pragmatic Programmers - CoffeeScript • O’Reilly - The Little Book on CoffeeScript
14. SASS
15. • Nothing • Absolutely not required • Just remove one line from your Gemfile • gem 'sass-rails' • And you don’t even have to do that What you HAVE to know
16. Is it SASS or SCSS? • Sass is the older style HAML-like indented syntax • SCSS is the new main syntax, which is a superset of CSS3
17. Why SASS? • Variables • Nesting • DRY up your styles • Mixins • reusable chunks • with arguments! • Selector Inheritance
18. Alternatives to SASS • Less • HSS • Other, technology specific • XCSS (PHP) • CleverCss (Python) • CSS Crush (PHP)
19. Asset Pipeline
20. assets dir
21. js manifest • Powered by - Sprockets • application.js // FIXME: Tell people that this is a manifest file, real code should go into discrete files // //= require jquery //= require jquery_ujs //= require_tree .
22. SASS - no sprockets • probably don’t want to use manifests • use @import, or your variables and scopes will not work
23. Dev vs Production • To precompile, or not to precompile • Heroku • Cedar stack • counter-intuitive settings
24. Compression • Uglifier (for javascript) • SCSS (for css)
25. But, Why?
26. Identity Map
27. • application.rb # Enable IdentityMap for Active Record, to disable set to false or remove the line below. config.active_record.identity_map = true enabling
28. problems • associations • STI • tests
29. nested has_many :through
30. class Project < ActiveRecord::Base has_many :tasks has_many :assignments, :through => :tasks has_many :users, :through => :assignments end
31. Migrations
32. class CreateProjects < ActiveRecord::Migration def change create_table :projects do |t| t.string :name t.timestamps end end end
33. HTTP Streaming
34. requirements • Ruby 1.9.2 (min) • Web server support • nginx • unicorn
35. Examples
36. New App
37. Upgrade
38. Bundler • Did you know... you can use bundler all the way down to Rails 2.1 apps?
39. • http://youtu.be/7UzGdqaDnp8 Add Bundler
40. • Upgrade the Gemfile • Config file changes • Move the assets
41. Configs • boot.rb • config.rb • development.rb • production.rb
42. Assets • Move asset folders • Fix image references • Manifests • stylesheet and javascript tag references
43. • Upgrading a Rails 2.1 app to Rails 3.1 in 1… Upgrade Demo